UGF are generally more trouble than they are worth, and are not needed if you have a sufficient quantity of LR, a protein skimmer, and a good clean-up crew (snails, hermits, shrimp). In fact, you won't even need a wet dry; a simple Berlin-style sump (no bio-balls or other media) should be sufficient.
My 120 g tank has the following for filtration: 80 lb live rock + 60 lb base rock (which is live by now), 20 lb live sand mixed w/ 60 lbs aragonite sand, Berlin-style pump w/ 2 filter bags (no media), Euro-reef protein skimmer.
Both the UGF and wet-dry filters can create a buildup of nitrates, which in turn will fuel algae growth. The UGF, particular, must be periodically removed and cleaned or it will clog - not an easy task.
Once you've added the live rock to your tank, you need to wait for it to cure, and for the tank to cycle; depending on the quality of the LR, this can take from a week to several weeks. Your first additions should be clean-up crew; mainly snails and hermits. Wait for the tank to equilibrate with them before adding anything else. I would encourage you to read up as much as possible on marine aquariums; Paletta's "The New Marine Aquarium" is an excellent starting point and a quick read.
